jackknife的一般过去时为：jackknifed...

v.对折，用折叠刀切( jackknife的第三人称单数 )...

jackknife的音标：jackknife的英式发音音标为：['dʒæknaɪf]jackknife的美式发音音标为：['dʒækˌnaɪf]...

v.对折，用折叠刀切( jackknife的过去式和过去分词 )...

He jackknifed on the sofa beside the Christmas tree.他弯腰地坐在圣诞树旁的沙发上....

jackknifes的音标：...

jackknife的现在完成时为：jackknifed...

jackknifed的音标：...

jackknife的现在进行时为：jackknifing...

jackknife的第三人称单数（三单）为：jackknifes...

Yes, simple ones like the swallow and jackknife but not fancy diving.跳的, 跳简单的例如燕式、弯身式,但不会跳花式.But, yahoo still is put in jackknife government issue.但是, 雅虎仍存在重叠管理问题.Two periodic jackknife, be helpful for national economy g...

n.折叠刀v.对折，用折叠刀切...